Transient magnetic field recorder

Abstract

The invention discloses a transient magnetic field recorder which comprises a test probe, a signal conditioning plate and an intelligent processing system which is formed by a computer and a high speed simulation acquisition card. A space magnetic induction intensity vector is converted into electric quantity signals in X, Y and Z directions, proportion amplification, lossless transmission and operation are carried out, and the intelligent processing system carries out acquisition, display and record treatments on the processed electric quantity signals in X, Y and Z directions and electric quantity which is directly proportional to magnetic induction intensity. Since the test probe carries out conversion of a magnetic signal into an electrical signal through a triaxial magnetic resistance sensor, point measurement is realized, a measurement bandwidth is high and can reach DC-5MHz, thus capturing a transient abnormal magnetic field can be realized, and a plurality of traditional inherent defects that using an induction coil to capture a magnetic field can not realize the point measurement of the magnetic field, respond to contradiction among a constant magnetic field, the bandwidth and sensitivity and satisfy a transient magnetic field test requirement well are overcome.

Description

technical field [0001] The invention belongs to the technical field of magnetic field recording, and more specifically relates to a recording instrument suitable for recording transient magnetic fields caused by circuit breakers, switches, lightning, abnormal errors, etc. in substations, especially intelligent or digital substations. Background technique [0002] During the actual operation of modern power systems, transient actions of primary equipment, such as circuit breakers, switches, lightning, and abnormal errors, will generate strong currents and cause transient magnetic fields. This magnetic field contains rich high-frequency harmonic components. Usually up to 1MHz or more. The high-frequency magnetic field has a strong penetrating ability, and the crosstalk generated by the internal circuit of the secondary equipment may cause system misoperation. [0003] In the modern power system, with the development of smart grid technology, especially the development of smar...

AI Technical Summary

Problems solved by technology

However, at present, the research on electromagnetic interference of smart substations at home and abroad is mainly concentrated in the theoretical stage, and there are many researches on algorithms and simulations, but there are no suitable test instruments.

[0005] The existing magnetic field measurement equipment cannot capture the transient abnormal magnetic field with rich high-frequency components, and cannot meet the needs

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